03. Lego Blocks

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _08LegoBlocks
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());

            // Create the matrix.
            List<List<int>> matrix = new List<List<int>>();
            List<int> row = new List<int>();

            for (int j = 1; j <= 2 * n; j++)
            {
                row = Console.ReadLine().Split(' ').Where(s => !string.IsNullOrWhiteSpace(s)).Select(int.Parse).ToList(); // Each row is a list.
                matrix.Add(row); // Add each row to a nested list named matrix.
            }

            // Check if two blocks fit together.
            bool fit = true;

            for (int i = 1; i < n; i++)
            {
                if (((matrix[i].Count + matrix[i + n].Count)) != (matrix[i - 1].Count + matrix[i - 1 + n].Count))
                {
                    fit = false;
                    break;
                }
            }

            // Print results.
            if (fit)
            {
                for (int i = 0; i < n; i++)
                {
                    matrix[i + n].Reverse();
                    Console.WriteLine("[" + string.Join(", ", matrix[i]) + ", " + string.Join(", ", matrix[i + n].ToList()) + "]");
                }
            }
            else
            {
                int sum = 0;

                // Sum of cells calculation.
                for (int i = 0; i < (2 * n); i++)
                {
                    sum += matrix[i].Count;
                }

                Console.WriteLine("The total number of cells is: {0}", sum);
            }
        }
    }
}